Parts for your 2005 Holden Commodore-Bump stops

2005 Holden Commodore bump stops — what they do and when to replace them

Yes, bump stops are fitted and absolutely relevant on the 2005 Holden Commodore (VZ series). Technical documentation backs this up: the Holden VZ Service/Workshop Manual lists a “jounce bumper” within the front strut assembly, the GM Holden Electronic Parts Catalogue (EPC) includes both front jounce bumpers and rear axle/IRS bump stops, and aftermarket fitment guides (e.g., Monroe Australia strut boot kits that include integral bump stops for VY–VZ Commodore) show direct applications. So if the question is whether a 2005 Commodore runs bump stops — it does, front and rear.

On this model, bump stops act like a tidy little safety net for the suspension. The front “jounce bumper” lives on the strut shaft under the dust boot, and the rear stop is mounted to the body/chassis to limit axle or control-arm travel (ute and wagon variants included). They prevent metal-on-metal bottoming when the car is fully loaded, hits a nasty pothole, or runs spirited through a dip. Beyond protecting shocks, struts, and control arms, bump stops add a progressive cushion at the end of travel, keeping alignment steadier, guarding tyres from harsh impacts, and trimming noise, vibration, and harshness.

Inspection is simple and should be part of routine servicing. At each service or roughly every 20,000 km, have a look (or ask the tech to look) for perished foam/rubber, splits, chunks missing, or a bump stop that’s riding loose on the shaft. If the dust boot is torn, the bump stop usually cops it next, so replace them as a set. They’re inexpensive but save expensive hardware from copping a hammering.

Replacement makes the most sense when doing front struts or rear shocks, or any time there’s bottoming, clunks at full compression, or a harsh thud over big hits. Replace in axle pairs to keep behaviour even left to right. For lowered cars, use quality shorter, progressive bump stops to maintain travel without crashy impacts. For towing or carrying loads, ensure the rear stops aren’t already sitting on contact at ride height. No grease or lube needed — just correct seating, intact dust boots, and torque values per the factory manual. Treat bump stops as cheap insurance for the rest of the Commodore’s suspension.

• Check at each service or ~20,000 km
• Replace with struts/shocks or if cracked, missing, or oil-soaked
• Use matched pairs and quality components

Popular questions

Does a 2005 Holden Commodore have bump stops?

Yes — the VZ Commodore uses front jounce bumpers inside the struts and rear bump stops on the body to control axle or IRS travel. These are documented in the Holden VZ Service Manual and shown in the GM Holden EPC, with broad aftermarket support confirming fitment.

How often should bump stops be replaced on a VZ Commodore?

They’re replaced on condition rather than mileage, but many owners swap them when fitting new struts/shocks (often around 100–150,000 km). If the dust boots are torn, the bump stops usually won’t be far behind. Any signs of cracking, missing chunks, or constant bottoming means it’s time.

What are the symptoms of worn or missing bump stops?

Harsh thuds over big compressions, the car feeling like it “crashes” at the end of travel, or fresh damage to dust boots are common clues. You might also notice odd tyre impact marks or the rear squatting onto the stops when loaded. A quick visual inspection will tell the story.